The sprites were hand-made from scratch and colored to look like Pokemon Red edition. I used a screenshot as a base for the "screen" and the text was created by using a downloadable font, which can be downloaded here: [Link]
I realize that the cries are a bit advanced for Gameboy, but it was the closest I was going for. Was originally gonna use the cries of an Eevee and a Growlithe, but they didn't match up too well. I also realize the audio at the end of the animation was a bit cut off, but that was due to YouTube's fault, not mine.
Hope you enjoy! :)
Frames drawn in Photoshop CS5 Extended. Animated in Macromedia Flash 8. Audio-edited in Audacity.